Oops... changed a 'tile' and forgot to change explanation. Doesn't affect group or solution though. Apologies!

A tough grid. I spotted the "Juliet" group immediately, but couldn't untangle the other three. One group connection feels too tenuous and open to debate, but the other three are great. Enjoyable overall. Thanks!

This is all getting a bit meta now with the Cluedo line. Caught out by my lack of aviation knowledge in the end.

Thumbs up.for originality even though by definition you were avoiding it...

I loved it - tricky, but then one suddenly sees it.

7/10. Didn't know the airlines. Liked the links link. The only limit to this puzzle format is the setter's imagination but I don't see many that can be described as original.

Liked this grid Only 7/10 as I didn't get the airlines. I was wondering if they were punchlines of bad jokes (Where's she from? Alaska/I'll ask her, How many ears does Spock have? The left ear, the right ear, the final frontier). Or maybe they contain names of middle aged men: Al, Ron, Del, Ian!

@Ian... you've made me smile, a lot!

@FirstGofer
Thanks. I really enjoyed the grid . Sometimes it's fun spotting connections that really aren't there!

6/10 The one line made me chuckle.